1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#define LOG_TAG "SQLiteGlobal" 18 19#include <jni.h> 20#include <JNIHelp.h> 21#include <android_runtime/AndroidRuntime.h> 22 23#include <sqlite3.h> 24#include <sqlite3_android.h> 25 26#include "android_database_SQLiteCommon.h" 27#include "android_util_Log.h" 28 29namespace android { 30 31// Limit heap to 8MB for now. This is 4 times the maximum cursor window 32// size, as has been used by the original code in SQLiteDatabase for 33// a long time. 34static const int SOFT_HEAP_LIMIT = 8 * 1024 * 1024; 35 36 37// Called each time a message is logged. 38static void sqliteLogCallback(void* data, int iErrCode, const char* zMsg) { 39 bool verboseLog = !!data; 40 if (iErrCode == 0 || iErrCode == SQLITE_CONSTRAINT || iErrCode == SQLITE_SCHEMA) { 41 if (verboseLog) { 42 ALOGV(LOG_VERBOSE, SQLITE_LOG_TAG, "(%d) %s\n", iErrCode, zMsg); 43 } 44 } else { 45 ALOG(LOG_ERROR, SQLITE_LOG_TAG, "(%d) %s\n", iErrCode, zMsg); 46 } 47} 48 49// Sets the global SQLite configuration. 50// This must be called before any other SQLite functions are called. 51static void sqliteInitialize() { 52 // Enable multi-threaded mode. In this mode, SQLite is safe to use by multiple 53 // threads as long as no two threads use the same database connection at the same 54 // time (which we guarantee in the SQLite database wrappers). 55 sqlite3_config(SQLITE_CONFIG_MULTITHREAD); 56 57 // Redirect SQLite log messages to the Android log. 58 bool verboseLog = android_util_Log_isVerboseLogEnabled(SQLITE_LOG_TAG); 59 sqlite3_config(SQLITE_CONFIG_LOG, &sqliteLogCallback, verboseLog ? (void*)1 : NULL); 60 61 // The soft heap limit prevents the page cache allocations from growing 62 // beyond the given limit, no matter what the max page cache sizes are 63 // set to. The limit does not, as of 3.5.0, affect any other allocations. 64 sqlite3_soft_heap_limit(SOFT_HEAP_LIMIT); 65 66 // Initialize SQLite. 67 sqlite3_initialize(); 68} 69 70static jint nativeReleaseMemory(JNIEnv* env, jclass clazz) { 71 return sqlite3_release_memory(SOFT_HEAP_LIMIT); 72} 73 74static JNINativeMethod sMethods[] = 75{ 76 /* name, signature, funcPtr */ 77 { "nativeReleaseMemory", "()I", 78 (void*)nativeReleaseMemory }, 79}; 80 81int register_android_database_SQLiteGlobal(JNIEnv *env) 82{ 83 sqliteInitialize(); 84 85 return AndroidRuntime::registerNativeMethods(env, "android/database/sqlite/SQLiteGlobal", 86 sMethods, NELEM(sMethods)); 87} 88 89} // namespace android 90